class Demo(object):
	"""description of class"""

	def __init__(self):
		self.name = '123';
		self.__age = 0;

	def demo(self):
		print('Demo.中的demo()方法');

	def __demo11(self):
		print('Demo.中的__demo11()方法');

	def demo11(self):
		self.__demo11();
dd = Demo();
print(dd.name)
#print(dd.age) #直接抛异常
dd.demo();
dd.demo11();